• Board contributors include instructors with "800" GMAT scores.
  • 95% of posts have replies within 24 hours.
  • Join for discounts with 800score, VeritasPrep and ManhattanGMAT

FAQ  - Register  - Search - Login 

All times are UTC - 7 hours

Post new topic Reply to topic  [ 2 posts ] 
Author Message
 Post subject: GMAT Verbal
PostPosted: Sat May 25, 2013 2:25 am 
User avatar

Joined: Tue Apr 13, 2010 8:48 am
Posts: 483
The passage suggests which of the following about bacteria studied microscopically?

A. They are likely to be misidentified several times before scientists reach a consensus.
B. They cannot be developed in such a way to infect a laboratory animal.
C. They are difficult to identify unless highlighted by conventional staining techniques.
D. They are less likely to be the cause of a disease than bacteria grown on standard laboratory media.
E. They are more challenging to analyze when placed on glass slides than on slides made of other materials.

(C) The specific bacteria discussed in the passage that is studied microscopically is the Legionella bacterium. Scientists failed to identify it for some time because conventional staining techniques did not 'take up' the bacteria, making it difficult to identify against the backdrop of a glass slide. Choice (C) is correct, as suggested by the relevant sentence in the first paragraph. While the causes of Legionnaire's were misidentified several times, we don't know whether that's generally true, eliminating (A). (B) confuses the microscopic theory with the first theory presented at the beginning of the passage, which is the same as the problem with (D). (E) focuses too much on the glass slides; the difficulty in identifying Legionella had more to do with the staining process than any details in the makeup of the slides.

The first sentence of the last paragraph of the passage ("However, pinning down the precise cause of a new disease is always full of pitfalls and wrong turns..") tempts me to pick A. This sentence generalizes but the reasoning given for why ' A' is wrong is that we don't know whether misidentification is generally true.

 Post subject: Re: GMAT Verbal
PostPosted: Sat May 25, 2013 2:26 am 
User avatar

Joined: Fri Apr 09, 2010 2:11 pm
Posts: 459
'Pitfalls and wrong turns' are not necessarily misidentification errors.

For choice (A) to be the best answer, there can never be any pitfalls or wrong turns that are not misidentifications. This is unlikely.

Generally speaking, if an answer choice is not directly stated or implied by the passage, it is not a valid inference.

Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 2 posts ] 

All times are UTC - 7 hours

Who is online

Users browsing this forum: No registered users and 1 guest

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
Template made by DEVPPL -
GMAT(TM) and GMAT CAT (TM) are registered trademarks of the Graduate Management Admission Council(TM). The Graduate Management Admission Council(TM) does not endorse, nor is affiliated in any way with the owner or any content of this site.